docs(sample): add custom retry algo samples

[whuffman36]

No description provided.

[snippet-bot]

Here is the summary of changes.

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• samples/snippets/src/main/java/com/example/bigquery/SetCustomRetryAlgorithm.java:19, tag bigquery_set_custom_retry_algorithm

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[whuffman36]

The sample and test will not build since the version of the sdk that the samples refer to has not been updated to include the PR that introduced the custom exception handler. This should be fixed when the samples are updated to refer to the latest version of the sdk.

[PhongChuong]

Thanks for the PR.

[PhongChuong]

I think we can simplify this by using the publicly available one at:
https://github.com/googleapis/sdk-platform-java/blob/f18318660c05d0d8466e3ead7127f0747fac2e2e/java-core/google-cloud-core/src/main/java/com/google/cloud/BaseService.java#L30

Just mentions that they can optionally implement their own.

[whuffman36]

Ah didn't know about this one, thanks! I put in a comment explaining how to implement your own.

[PhongChuong]

Just realized, you might want to change the PR title to:
docs(sample): add custom retry algo samples
So it doesn't bump the semantic version.

[PhongChuong]

/gcbrun